Collective excitations of hydrodynamically coupled driven colloidal particles.

Two colloidal particles, driven around an optical vortex trap, have been recently shown to pair due to an interplay between hydrodynamic interactions and the curved path they are forced to follow. We demonstrate here that this pairing interaction can be tuned experimentally, and we study its effect on the collective excitations of many particles driven around such an optical trap. We find that even though the system is overdamped, hydrodynamic interactions due to driving give rise to nondecaying excitations with characteristic dispersion relations. The collective excitations of the colloidal ring reflect fluctuations of particle pairs rather than those of single particles.

• Publication year

  2013

• Venue

  Physical review. E, Statistical, nonlinear, and soft matter physics

• Publication date

  2013-12-23

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevE.90.042302arXiv 1312.6576PMID 25375489
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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